Puella Magi Madoka Magica

I started watching this knowing nothing except that it was a 'dark' magical girl series. I've never seen any of the magical girl stuff (unless Claymore counts?) so I had no idea of how it was using/subverting the usual tropes. Still, it was pretty amazing... and very dark. By the time I got to the 9th episode I was feeling pretty distraught over the fates of all the characters and how awful the whole system was.

One thing that particularly stood out for me was the animation and the various styles to represent the bizarre Witches and the Labyrinths they create. While the main characters usually remain in regular anime mode everything else becomes a wild collage of symbols and strange creatures that symbolize the Witch and her obsessions. Each one seems to be a mysterious story unto itself.

Don't let the cutesy character designs fool you though... this isn't for kids, both because it's so disturbing and also because I don't think they'd really understand it once the true nature of the magical girls starts to come out.